1. **Problem Statement:** A trader mixes 26 kgs of rice costing 20 per kg with 30 kgs of another variety costing 36 per kg. He sells the mixture at 30 per kg. We need to find his profit percentage. 2. **Formula for Profit Percentage:** $$\text{Profit Percentage} = \left(\frac{\text{Selling Price} - \text{Cost Price}}{\text{Cost Price}}\right) \times 100$$ 3. **Calculate Cost Price (CP):** Cost of first variety = $26 \times 20 = 520$ Cost of second variety = $30 \times 36 = 1080$ Total Cost Price = $520 + 1080 = 1600$ 4. **Calculate Selling Price (SP):** Total weight = $26 + 30 = 56$ kgs Selling price per kg = $30$ Total Selling Price = $56 \times 30 = 1680$ 5. **Calculate Profit:** Profit = $\text{SP} - \text{CP} = 1680 - 1600 = 80$ 6. **Calculate Profit Percentage:** $$\text{Profit Percentage} = \left(\frac{80}{1600}\right) \times 100 = 5\%$$ **Final answer:** The trader makes a profit of 5%.